This LFCS practice question tests your understanding of user and group management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Refer to the exhibit.
# ls -ld /shared
drwxrws--- 3 root developers 4096 Apr 10 10:00 /shared
# ls -l /shared
drwxrws--- 2 alice developers 4096 Apr 10 10:00 project
-rw-rw---- 1 bob developers 1024 Apr 10 10:05 file.txt
Refer to the exhibit. The 'developers' group has members alice, bob, and charlie. User 'charlie' is not in the 'developers' group. Which statement is true?
Refer to the exhibit.
# ls -ld /shared
drwxrws--- 3 root developers 4096 Apr 10 10:00 /shared
# ls -l /shared
drwxrws--- 2 alice developers 4096 Apr 10 10:00 project
-rw-rw---- 1 bob developers 1024 Apr 10 10:05 file.txt
A
alice can write to file.txt because she is in the developers group and the file has group write.
File has rw-rw----, group can write; alice is in developers, so she can write.
B
bob can delete /shared/project because he is the owner? No, directory permissions apply.
Why wrong: Bob is not owner of project (alice owns), but he can delete if he has write and execute on the parent directory, which he does. However, the statement says 'because he is the owner' which is false.
C
charlie can read /shared because the directory has world read? No, it's --- for others.
Why wrong: Others have no permissions (---).
D
charlie can list the contents of /shared if he knows the path.
Why wrong: No, charlie has no permissions on /shared.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
alice can write to file.txt because she is in the developers group and the file has group write.
The setgid bit (s in group execute) on /shared means new files inherit the group (developers). However, /shared has permissions 770 for owner and group, so charlie (not in group) cannot access it.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
alice can write to file.txt because she is in the developers group and the file has group write.
Why this is correct
File has rw-rw----, group can write; alice is in developers, so she can write.
Related concept
Static NAT maps one inside address to one outside address.
✗
bob can delete /shared/project because he is the owner? No, directory permissions apply.
Why it's wrong here
Bob is not owner of project (alice owns), but he can delete if he has write and execute on the parent directory, which he does. However, the statement says 'because he is the owner' which is false.
✗
charlie can read /shared because the directory has world read? No, it's --- for others.
Why it's wrong here
Others have no permissions (---).
✗
charlie can list the contents of /shared if he knows the path.
Why it's wrong here
No, charlie has no permissions on /shared.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related LFCS NAT questions on configuration and troubleshooting.
User and Group Management — This question tests User and Group Management — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: alice can write to file.txt because she is in the developers group and the file has group write. — The setgid bit (s in group execute) on /shared means new files inherit the group (developers). However, /shared has permissions 770 for owner and group, so charlie (not in group) cannot access it.
What should I do if I get this LFCS question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related LFCS NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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